Repeatedly getting "The encrypted content ... could not be verified"

{
"error": {
"message": "The encrypted content gAAA...DQ== could not be verified.",
"type": "invalid_request_error",
"param": null,
"code": "invalid_encrypted_content"
}
}

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thread ID 019b2889-d0f2-7713-8046-20bdf342d5d7 in an existing issue.